Improvement in aie-pumps



@eine tat Battiti @frn Letters Patent No. 69,423, dated October 1, 1867.

IMPROVEMENT IN AIR-PUMPS.

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'IO .ALL WIIOM I'l MAY OONOERN:

Be it known that I, HENRY GE'ITY, of Brooklyn, in the county of Kings, and State of New York, have invented a new and improved Test-Pump and Gauge g and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in thc art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

Ihe present invention relates te a combined pump and gauge more especially intended for the testing of gas or other piping or tubing.

In the accompanying plate ot' drawings my improvements in test-pumps and gauges are illustrated, the figure being a central vertical section through the same, and its connection or coupling for the piping or tubing.

A, in th-c drawings, represents the pumping-cylinder or barrel, closed at cach end by head-plates B, and at its lower end secured to a suitable board or hase, O. D, the pis-tou or plunger-head, arranged to move air-tight within the barrel or cylinder A, and E the piston-rod or stem, secured to the head D, and extending therefrom up through the upper cylinder-head, with a handle, F, upon its upper and outer end. n. u, air-holes in the upper headto pump-cylinder, through which air is admitted thereto. Through the piston-head is an air-passage, b, closed by a cheek-valve, c, arranged to allow the air to pass down through the head, but to prevent its passage up and through it, as the head is being forced down through the pump-barrel. G, a pipe connected at lower end of pump-barrel A, from which it extends upward along the outside of the said cylinder, and enters at its upper end a chamber, II, formed upon the outside of the cylinder, and through a coupling, I, to be connected with the gas piping or tubing in any suitable manner. J, a check-valve at end of chamber II, arranged to open in the direction represented by the arrow. In the chamber J2 to the coupling I, a diaphragm, K, is iixed around its edges. On this diaphragm restsa stem or plug, L, that passes upward through the chamber J2 to and out through its head M, as shown; this stein being suitably graduated or marked oil` to indicate the pressure of air within the coupling, and consequently that within the tubing or piping connected therewith. N, a spiral or coiled spring surrounding stem L, and acting to hold it down upon the diaphragm. O, an ether-cu p screwed into upper side of coupling I, and communicating through its passage CZ with the interior of" the same. I), a plug screwing into enlarged end of passage Cl, and stopping up the same; this plug being provided with a side and central passage,f, for allowing the ether within the cup to ilow from the same into the coupling, when such plug-passage has been opened thereto, by properly turning out the plug therefor. Q, a groove or channel around the inside of eoupling'I, for catching the ether passing into the coupling from the cup, and holding it, while the air-blast through the coupling diffuses its vapors through the pipes or tubes to enable any leak thereon to be discovered.

lhe pump herein described is operated as thc ordinary test-pumps, the air passing therefrom through the tube G into the'coupling I, and from thence te the piping or tubing with which suoli coupling is connected at its end "I, and acting upon the diaphragm K, when, the pressure having become sufficient to counteract the pressure of the spring around the stem L, the said stem is raised or lifted out of the chamber J2 in direct proportion to suoli incre-ase ot` pressure. A suiiicicnt'dcgrcc of' pressure having thus been obtained, the pumping operation is then stopped, when, if there is any leak or vent-hole or holes in the tubing, the indicator will fall for obvious reasons. If a leak is thus ascertained or found to exist in the piping, to ascertain its locality, ether is then admitted to the coupling I by opening the passage LZ through the ether-cup O, when, then again pumping, the vapors arisingfroin such ether are thus diffused and forced with the air through the pipes as in the ordinary test-pumps. Byiueans of the ether-cup O, and its plug I), ether can be admitted to the coupling I without uncoupling the pump from the piping, as has heretofore been the easean advantage et much iniportance. By locating the coupling I, carryingthe indicator and ether-cup at the upper end ot' the puinping-cylinder, the indicator is most convciiicnt for examination and inspection, and the parts are out of the way of danger, and of being damaged or injured. i

IIaving thus described niy'invcntion, what I elainras new7 and desire to secure by Letters Iatent, is

'.lhe gauge K I, M, cup O I?, coupling I., having recess Q, all arranged to operate in connection with an air-pump, as herein shown and described. Y

'ihe above specification of my invention signed by me this 27th day of April, 1867.

HENRY GE'ITY.

Witnesses:

Wt. F. `l\[cNAu,\nA, Animar W. BuowN. 

